Sword of Festung

It is rare for a warrior serving the Festung to remain there for long, but those who fully embrace their service attain great power in exchange. Years of conditioning and careful preparations are required for one of the guards of the dark mages to be able to survive the ritual that infuses them with forbidden arcane gifts, yet the fell rewards awaiting those who survive are enough to tempt many.

You gain the following features.

Evil. You radiate an Evil aura.

Foul Smite. Whenever you hit a creature with a weapon attack you can choose to deliver a foul smite that deals additional necrotic damage equal to half your level. You can use this feature a number of times equal to half your proficiency bonus, and regain spent uses upon finishing a long rest .

Magic Resistant. You gain an  expertise die on saving throws against spells and magical effects.

Valya Resistant. You gain an expertise die on saving throws made against celestials, fiends, and other valya.